"What did you do the year before last?"
I forgot to put か at the end and was counted correct... Does that make sense given the rest of the sentence?
Me too! I understand why, bcuz a Japanese person would understand the implied question since 何 is in there but Duo is usually such a stickler for it I found it odd
You can just type おととし then press spacebar to convert it to kanji. For おととし it should only give you one suggestion in the pop-up conversion list. ^^
Keep in mind you need to enable japanese input on your phone's settings.